Introduction: Females with transfusion-dependent β-thalassemia (TDT) display menstrual irregularities and subfertility at certain points in their lives, even if well-chelated, representing a significant physical and psychological burden. Little is known about the effects of pituitary and ovarian iron contents on ovarian reserve and function. Hence, this study aimed to assess ovarian reserve and pituitary-gonadal axis function in adolescent females with TDT and correlate them with pituitary and ovarian volume, pituitary iron load, and serum ferritin. Methods: Fifty adolescent females with TDT were compared to 50 age-matched healthy females. Age of diagnosis of TDT, transfusion index, type of chelation therapy, age at menarche, and Tanner breast stage were assessed. Serum follicle-stimulating hormone (FSH), luteinizing hormone (LH), anti-Müllerian hormone (AMH), and ferritin were measured. Magnetic resonance imaging (MRI) pituitary iron content R2* and T2* were measured, and 3-D transabdominal ovarian ultrasound performed. Results: The mean age of the studied females with TDT was 14.54 ± 2.24 years. Ovarian insufficiency was found in 20 of them (40%). Compared to controls, adolescent females with TDT had significantly delayed age of menarche, AMH, FSH, LH, antral follicle count (AFC), and ovarian volume. Upon comparing those with ovarian insufficiency and those without, adolescents with TDT having ovarian insufficiency had significantly higher serum ferritin and pituitary MRI-R2* than those without insufficiency. Multivariate-logistic regression showed that pituitary MRI-R2* was the most significant independent variable associated with ovarian insufficiency among adolescent females with TDT. Conclusion: Adolescent females with TDT have decreased ovarian reserve, AFC, and gonadotropins that are correlated with serum ferritin, pituitary iron load, and ovarian volume. Hence, regular ovarian reserve assessment should be implemented as a part of endocrinological follow-up of females with TDT advising procedures to preserve fertility to those who are likely to have ovarian insufficiency.

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